Would anyone be able to tell me what is causing these brown spots on leaves on my small potted bay tree. Many leaves have tiny spots only but a few are as bad as this one but I want to nip the problem in the bud before it gets worse. I live in Grafton so it's getting cold at nights but it is partially under cover and doesn't get a lot of sun. It's been fine since I bought and repotted it about a yer ago. I'm not sure if I have overwatered it. Could this be the problem? Thanks.

It could possibly be a fungal problem if it has not been getting enough light. I would suggest you spray it with a fungicide ( readily available in garden sections at some supermarkets or certainly at nursery suppliers and garden centres).